Temperature change compositions and tissue products providing a cooling sensation

ABSTRACT

Wiping products, such as facial tissues, contain a temperature change composition that can provide a cooling sensation when contacted with the skin of a user. The temperature change composition is structured emulsion that may include a phase change material, a carrier, a surfactant, and a crystalline initiator. The phase change materials, in one embodiment, can have a relatively high heat of fusion. When undergoing a phase change, the temperature change composition absorbs heat and thereby provides a cooling feeling or cooling sensation to the skin of a user.

BACKGROUND

Numerous healthcare and cosmetic products are applied to the skin inorder to provide various benefits. Such products can include, forinstance, lotions, creams, moisturizers, and the like. In somecircumstances, the products are intended to provide a cooling feeling orcooling sensation to the skin once applied. Existing products typicallyprovide skin cooling by combining skin cooling agents with othersubstances.

There are several different means to impart a cooling sensation to theskin, including using evaporation, neurosensory components, orthermodynamic agents such as phase change materials. One example of acooling agent is menthol which provides cooling in the form of aphysiological or neurosensory effect on nerve endings in the human bodythat sense temperature. The cooling sensation from menthol is not due tolatent heat of evaporation but appears to be the result of directstimulus on the cold receptors at the nerve endings.

The use of phase change materials to impart cooling is discussed, forinstance, in PCT International Publication No. WO 2006/007564 entitled“Cosmetic Compositions and Methods for Sensory Cooling”, which isincorporated herein by reference. In the '564 application, a skincarecosmetic composition is described in the form of a lotion that isintended for use in after-sun products, after-shave products, and bodymoisturizing products. The lotion is intended to create a coolingsensation on the skin by incorporating into the lotion components thatabsorb heat from the skin. In particular, ingredients are incorporatedinto the lotion that absorb heat from the skin and melt. The componentshave a relatively high heat of fusion which is defined in the '564application as the heat absorbed by unit of mass of a solid chemicalelement at its melting point in order to convert the solid into a liquidat the same temperature. The '564 application states that the relativelyhigh heat of fusion facilitates the absorption of heat from the skin toaid in melting the solid ingredient when applied to the skin, therebycooling the skin temperature.

The use of phase change agents to impart cooling in tissues isdisclosed, for instance, in PCT Patent Application No. PCT/IB2009/051515entitled “Tissue Products having a Cooling Sensation When Contacted withSkin”. The '515 application discloses the use of a phase change agentbetween multiple layers of a dry tissue web with a separate hydrophobiclotion layer on the exterior surfaces of the tissue product to provide acooling sensation. This approach is problematic since components of thehydrophobic lotion can migrate into the hydrophobic phase change agentand disrupt its ability to cool. Alternatively, the phase change agentcan migrate into the lotion on the exterior of the tissue and may causeirritation to the skin.

Therefore, a need exists for a means to effectively hold a phase changeagent on or within a substrate, such as a tissue, such that it will coolthe skin without allowing irritation to the skin. There also exists aneed for a substrate, such as a tissue containing the composition, suchthat the composition can be delivered to the nose to moisturize, cooland soothe irritated noses, while holding this phase change agent withinthe substrate, keeping it from irritating skin.

SUMMARY

Generally, dry wiping products and particularly dry substrates that,when held against the skin, can provide a cooling sensation aredisclosed. In one embodiment, for instance, the substrate may be afacial tissue. The facial tissue can be used to provide comfort to auser's nose. For example, when suffering from the common cold, aperson's nose can become inflamed and sore. In one embodiment, a tissueproduct that can not only be used to wipe one's nose, but can alsoprovide the nose with a cooling sensation giving comfort and relief isdisclosed.

The present disclosure is also related to a temperature changecomposition made of a structured emulsion containing a phase changematerial, a crystalline initiator, a carrier, and a surfactant. Thetemperature change composition undergoes a phase change at a temperaturebetween about 20° C. and 32° C. for cooling the skin during use of thedry tissue or similar dry wiping product. Use of a structured emulsionhelps to transfer the composition to the skin but limits or eliminatescontacting of the phase change material with the skin of the user and/ortransferring to the skin and/or wicking from the product. Thus, thestructured emulsion can reduce irritation and prevent removal of thephase change agents from the product prior to use.

The structured emulsion for use with the temperature change compositionmay be selected from various types of structured emulsion including, butnot limited to, an alpha-phase emulsion, a discontinuous cubic (micellarcubic) emulsion, a hexagonal phase emulsion, a lamellar emulsion, abicontinuous cubic emulsion, a reverse hexagonal emulsion, an inversecubic emulsion, or a d-phase emulsion. Desirably, the structuredemulsion is a d-phase emulsion.

The phase change agent incorporated into the temperature changecomposition can vary depending upon the particular application and thedesired result. The phase change agent, for instance, may be an oilsoluble and hydrophobic material. Examples of phase change agentsinclude hydrocarbons, waxes, oils, natural butters, fatty acids, fattyacid esters, dibasic acids, dibasic esters, 1-halides, primary alcohols,aromatic compounds, anhydrides, ethylene carbonates, polyhydricalcohols, and mixtures thereof. In one embodiment, for instance, aplurality of phase change agents can be incorporated into thetemperature change composition. Particular examples of phase changeagents well suited for use in the present disclosure include tricaprin,parrafin, nonadecane, octadecane, stearyl heptanoate, lauryl lactate,lauryl alcohol, capric acid, caprylic acid, cetyl babassuate, mangiferaindica (mango) seed butter, theobroma cacao (cocoa) seed butter,butyrospermum parkii butter, Di-C₁₂₋₁₅ Alkyl Fumarate, stearylcaprylate, cetyl lactate, cetyl acetate, C₂₄₋₂₈ alkyl methicone,glyceryl dilaurate, stearamidopropyl PG-dimonium chloride phosphate,jojoba esters, and combinations thereof.

The phase change component may be present in an amount between about 1%by weight of the temperature change composition and about 99.9% byweight of the temperature change composition, more desirably betweenabout 20% by weight of the temperature change composition and about 90%by weight of the temperature change composition, and even more desirablybetween about 50% by weight of the temperature change composition andabout 80% by weight of the temperature change composition.

In an exemplary embodiment, the crystalline initiator is selected fromfatty alcohols, fatty acids, esters, sugars, salts, crystalline andmicrocrystalline waxes, microcrystalline triglycerides, and combinationsthereof.

Typically, the crystalline initiator may be present in an amount betweenabout 0.1% by weight of the temperature change composition and about 30%by weight of the temperature change composition, more desirably fromabout 1% by weight of the temperature change composition to about 25% byweight of the temperature change composition, and even more desirablyfrom about 2% by weight of the temperature change composition to about20% by weight of the temperature change composition.

The temperature change composition also includes a carrier. Desirably,the carrier may be selected from water, glycerin, diglycerin, glycerinderivatives, glycols, glycol derivatives, sugars, ethoxylated and/orpropoxylated esters and ethers, urea, sodium PCA, alcohols, ethanol,isopropyl alcohol, and combinations thereof.

Typically, the temperature change compositions may contain a carrier inan amount from about 1% by weight of the temperature change compositionto about 40% by weight of the temperature change composition, moretypically from about 2% by weight of the temperature change compositionto about 25% by weight of the temperature change composition.

The temperature change composition also contains a surfactant. Examplesof suitable additional surfactants include, for example, anionicsurfactants, cationic surfactants, amphoteric surfactants, zwitterionicsurfactants, non-ionic surfactants, and combinations thereof. Specificexamples of suitable surfactants are known in the art and include thosesuitable for incorporation into personal care compositions and tissues.The temperature change composition may suitably include one or moresurfactants in an amount from about 0.5% by weight of the temperaturechange composition to about 15% by weight of the temperature changecomposition, more desirably from about 1% by weight of the temperaturechange composition to about 15% by weight of the temperature changecomposition, and even more desirably from about 2% by weight of thetemperature change composition to about 7% by weight of the temperaturechange composition.

The dry substrate may be a product that is made from at least one web offibers, such as pulp fibers alone or in combination with syntheticfibers. The temperature change composition may be present on at leastone side of the web.

Other features and aspects of the present disclosure are discussed ingreater detail below.

BRIEF DESCRIPTION OF THE DRAWINGS

A full and enabling disclosure of the present invention, including thebest mode thereof to one skilled in the art, is set forth moreparticularly in the remainder of the specification, including referenceto the accompanying figures, in which:

FIG. 1 is a perspective view of one embodiment of a wiping product madein accordance with the present disclosure;

FIG. 2 is a cross-sectional view of the wiping product illustrated inFIG. 1;

FIG. 3 is a cross-sectional view of another embodiment of a wipingproduct made in accordance with the present disclosure; and

FIG. 4 is a perspective view of one embodiment of a spirally wound bathtissue product made in accordance with the present disclosure.

Repeated use of reference characters in the present specification anddrawings is intended to represent the same or analogous features orelements of the present invention.

DETAILED DESCRIPTION

It is to be understood by one of ordinary skill in the art that thepresent discussion is a description of exemplary embodiments only, andis not intended as limiting the broader aspects of the presentinvention.

Dry, as used herein to describe tissue or wiping products, means thatthe product is supplied without any moisture beyond the equilibriummoisture that is generally associated with the product. The “equilibriummoisture” is the moisture that the sheet contains when exposed toambient conditions for extended periods of time. The equilibriummoisture within the sheet will not change with time at the same relativehumidity and temperature. The dry products will have equilibriummoisture contents typically of less than 15%, such as less than 10% suchas from about 3% to about 8% under most ambient conditions that areencountered during routine use of the product.

The heat absorption factor, as used herein, expressed in J/m² is definedas the product of the heat of fusion of the cooling compositionexpressed in J/gram and the application rate of the cooling compositionapplied to the tissue product expressed in gsm.

Latent heat of fusion and melting points are determined by differentialscanning calorimetry (DSC). Melting point, as defined herein, refers tothe peak melt temperature as determined by DSC. Samples may be analyzedon a TA Instruments DSC 2920 Modulated DSC (Standard Cell) using thefollowing experimental procedure: Approximately 5 mg of the respectivematerial was weighed to the nearest 0.1 mg. Samples are run in thetemperature interval from −50° C. to 100° C. with a heating/cooling rateof 10° C./min in an inert gas (N₂) atmosphere. The heat of fusion(ΔH_(f)) is computed from the integral under the respective meltingpeak, with the reported results being the average value from 3heating/cooling cycles.

The present disclosure is generally directed to dry wiping products,such as dry tissue products, that have improved perceived benefits. Inparticular, wiping products made in accordance with the presentdisclosure, when in contact with the skin, can provide a coolingsensation and feeling. The cooling sensation can, for instance, providecomfort and a soothing feeling to irritated skin. It is also found, thatwhen used with a bath tissue, cooling can also evoke a sensation ofwetness which can lead to a perception of improved cleaning. In oneembodiment, the wiping product can be designed to provide a coolingsensation while transferring the composition to the skin but limiting oreliminating the contact of the phase change material from the skin ofthe user.

In one embodiment, for instance, the present disclosure is directed to adry wiping product, such as a facial tissue product, that contains atemperature change composition. The temperature change compositionincludes at least one phase change material that undergoes a phasechange when elevated in temperature. The phase change material, forexample, can have a relatively high heat of fusion which allows it toabsorb great amounts of thermal energy and to regulate to a lowertemperature than the environment. In particular, when the wiping productis heated, such as being in contact with one's skin, the phase changematerial quickly warms to its melting point. Due to the high heat offusion, significant amounts of heat can then be absorbed while the phasechange material is melted. In turn, a cooling sensation is provided tothe skin of the user.

Referring to FIG. 1, one embodiment of a tissue product 10 made inaccordance with the present disclosure is shown. The tissue product 10can be any suitable base sheet made from various different types offiber furnishes. The tissue product 10 can also be a single ply productor can contain multiple tissue webs laminated together.

Tissue webs that may be used to construct the tissue product 10, forinstance, can generally contain pulp fibers either alone or incombination with other fibers. Each tissue web can generally have a bulkdensity of at least 2 cc/g, such as at least 3 cc/g.

Fibers suitable for making tissue webs contain any natural or syntheticcellulosic fibers including, but not limited to, non-woody fibers, suchas cotton, abaca, kenaf, sabai grass, flax, esparto grass, straw, jutehemp, bagasse, milkweed floss fibers, and pineapple leaf fibers; andwoody or pulp fibers such as those obtained from deciduous andconiferous trees, including softwood fibers, such as northern andsouthern softwood kraft fibers; hardwood fibers, such as eucalyptus,maple, birch, and aspen. Pulp fibers can be prepared in high-yield orlow-yield forms and can be pulped in any known method, including kraft,sulfite, high-yield pulping methods and other known pulping methods.Fibers prepared from organosolv pulping methods can also be used,including the fibers and methods disclosed in U.S. Pat. No. 4,793,898issued Dec. 27, 1988 to Laamanen et al.; U.S. Pat. No. 4,594,130 issuedJun. 10, 1986 to Chang et al.; and U.S. Pat. No. 3,585,104 issued Jun.15, 1971 to Kleinert. Useful fibers can also be produced byanthraquinone pulping, exemplified by U.S. Pat. No. 5,595,628 issuedJan. 21, 1997 to Gordon et al.

A portion of the fibers, such as up to 50% or less by dry weight, orfrom about 5% to about 30% by dry weight, can be synthetic fibers suchas rayon, polyolefin fibers, polyester fibers, bicomponent sheath-corefibers, multi-component binder fibers, and the like. An exemplarypolyethylene fiber is Pulpex®, available from Hercules, Inc.(Wilmington, Del.). Any known bleaching method can be used. Syntheticcellulose fiber types include rayon in all its varieties and otherfibers derived from viscose or chemically-modified cellulose. Chemicallytreated natural cellulosic fibers can be used such as mercerized pulps,chemically stiffened or crosslinked fibers, or sulfonated fibers. Forgood mechanical properties in using papermaking fibers, it can bedesirable that the fibers be relatively undamaged and largely unrefinedor only lightly refined. While recycled fibers can be used, virginfibers are generally useful for their mechanical properties and lack ofcontaminants. Mercerized fibers, regenerated cellulosic fibers,cellulose produced by microbes, rayon, and other cellulosic material orcellulosic derivatives can be used. Suitable papermaking fibers can alsoinclude recycled fibers, virgin fibers, or mixes thereof. In certainembodiments capable of high bulk and good compressive properties, thefibers can have a Canadian Standard Freeness of at least 200, morespecifically at least 300, more specifically still at least 400, andmost specifically at least 500.

Other papermaking fibers that can be used in the present disclosureinclude paper broke or recycled fibers and high yield fibers. High yieldpulp fibers are those papermaking fibers produced by pulping processesproviding a yield of about 65% or greater, more specifically about 75%or greater, and still more specifically about 75% to about 95%. Yield isthe resulting amount of processed fibers expressed as a percentage ofthe initial wood mass. Such pulping processes include bleachedchemithermomechanical pulp (BCTMP), chemithermomechanical pulp (CTMP),pressure/pressure thermomechanical pulp (PTMP), thermomechanical pulp(TMP), thermomechanical chemical pulp (TMCP), high yield sulfite pulps,and high yield Kraft pulps, all of which leave the resulting fibers withhigh levels of lignin. High yield fibers are well known for theirstiffness in both dry and wet states relative to typical chemicallypulped fibers.

In general, any process capable of forming a tissue web can also beutilized in the present disclosure. For example, a papermaking processof the present disclosure can utilize creping, wet creping, doublecreping, embossing, wet pressing, air pressing, through-air drying,creped through-air drying, uncreped through-air drying, hydroentangling,air laying, as well as other steps known in the art.

The tissue web may be formed from a fiber furnish containing pulp fibersin an amount of at least about 50% by weight, such as at least about 60%by weight, such as at least about 70% by weight, such as at least about80% by weight, such as at least about 90% by weight, such as 100% byweight.

Also suitable for products of the present disclosure are tissue sheetsthat are pattern densified or imprinted, such as the tissue sheetsdisclosed in any of the following U.S. Pat. No. 4,514,345 issued on Apr.30, 1985 to Johnson et al.; U.S. Pat. No. 4,528,239 issued on Jul. 9,1985 to Trokhan; U.S. Pat. No. 5,098,522 issued on Mar. 24, 1992 toSmurkoski et al.; U.S. Pat. No. 5,260,171 issued on Nov. 9, 1993 toSmurkoski et al.; U.S. Pat. No. 5,275,700 issued on Jan. 4, 1994 toTrokhan; U.S. Pat. No. 5,328,565 issued on Jul. 12, 1994 to Rasch etal.; U.S. Pat. No. 5,334,289 issued on Aug. 2, 1994 to Trokhan et al.;U.S. Pat. No. 5,431,786 issued on Jul. 11, 1995 to Rasch et al.; U.S.Pat. No. 5,496,624 issued on Mar. 5, 1996 to Steltjes, Jr. et al.; U.S.Pat. No. 5,500,277 issued on Mar. 19, 1996 to Trokhan et al.; U.S. Pat.No. 5,514,523 issued on May 7, 1996 to Trokhan et al.; U.S. Pat. No.5,554,467 issued on Sep. 10, 1996 to Trokhan et al.; U.S. Pat. No.5,566,724 issued on Oct. 22, 1996 to Trokhan et al.; U.S. Pat. No.5,624,790 issued on Apr. 29, 1997 to Trokhan et al.; and U.S. Pat. No.5,628,876 issued on May 13, 1997 to Ayers et al., the disclosures ofwhich are incorporated herein by reference to the extent that they arenon-contradictory herewith. Such imprinted tissue sheets may have anetwork of densified regions that have been imprinted against a drumdryer by an imprinting fabric, and regions that are relatively lessdensified (e.g., “domes” in the tissue sheet) corresponding todeflection conduits in the imprinting fabric, wherein the tissue sheetsuperposed over the deflection conduits was deflected by an air pressuredifferential across the deflection conduit to form a lower-densitypillow-like region or dome in the tissue sheet.

The tissue web can also be formed without a substantial amount of innerfiber-to-fiber bond strength. In this regard, the fiber furnish used toform the base web can be treated with a chemical debonding agent. Thedebonding agent can be added to the fiber slurry during the pulpingprocess or can be added directly to the headbox. Suitable debondingagents that may be used in the present disclosure include cationicdebonding agents such as fatty dialkyl quaternary amine salts, monofatty alkyl tertiary amine salts, primary amine salts, imidazolinequaternary salts, silicone quaternary salt and unsaturated fatty alkylamine salts. Other suitable debonding agents are disclosed in U.S. Pat.No. 5,529,665 issued on Jun. 25, 1996 to Kaun which is incorporatedherein by reference. In particular, Kaun '665 discloses the use ofcationic silicone compositions as debonding agents.

In one embodiment, the debonding agent used in the process of thepresent disclosure is an organic quaternary ammonium chloride and,particularly, a silicone-based amine salt of a quaternary ammoniumchloride. For example, the debonding agent can be PROSOFT® TQ1003,marketed by the Hercules Corporation. The debonding agent can be addedto the fiber slurry in an amount from about 1 kg per metric tonne toabout 10 kg per metric tonne of fibers present within the slurry.

In an alternative embodiment, the debonding agent can be animidazoline-based agent. The imidazoline-based debonding agent can beobtained, for instance, from the Witco Corporation (Greenwich, Conn.).The imidazoline-based debonding agent can be added in an amount ofbetween 2 kg per metric tonne to about 15 kg per metric tonne.

In one embodiment, the debonding agent can be added to the fiber furnishaccording to a process as disclosed in PCT Application having anInternational Publication No. WO 99/34057 filed on Dec. 17, 1998 or inPCT Published Application having an International Publication No. WO00/66835 filed on Apr. 28, 2000, which are both incorporated herein byreference. In the above publications, a process is disclosed in which achemical additive, such as a debonding agent, is adsorbed ontocellulosic papermaking fibers at high levels. The process includes thesteps of treating a fiber slurry with an excess of the chemicaladditive, allowing sufficient residence time for adsorption to occur,filtering the slurry to remove unadsorbed chemical additives, andredispersing the filtered pulp with fresh water prior to forming anonwoven web.

Optional chemical additives may also be added to the aqueous papermakingfurnish or to the formed embryonic web to impart additional benefits tothe product and process and are not antagonistic to the intendedbenefits of the dry substrate. The following materials are included asexamples of additional chemicals that may be applied to the web alongwith the temperature change composition. The chemicals are included asexamples and are not intended to limit the scope of the invention. Suchchemicals may be added at any point in the papermaking process,including being added simultaneously with the additive composition inthe pulp making process, wherein said additive or additives are blendeddirectly with the additive composition.

Additional types of chemicals that may be added to the paper webinclude, but are not limited to, absorbency aids usually in the form ofcationic, anionic, or non-ionic surfactants, humectants and plasticizerssuch as low molecular weight polyethylene glycols and polyhydroxycompounds such as glycerin and propylene glycol. Materials that supplyskin health benefits such as mineral oil, aloe extract, vitamin E,silicone, lotions in general, and the like, may also be incorporatedinto the finished products.

In general, the products can be used in conjunction with any knownmaterials and chemicals that are not antagonistic to its intended use.Examples of such materials include, but are not limited to, odor controlagents, such as odor absorbents, activated carbon fibers and particles,baby powder, baking soda, chelating agents, zeolites, perfumes or otherodor-masking agents, cyclodextrin compounds, oxidizers, and the like.Superabsorbent particles, synthetic fibers, or films may also beemployed. Additional options include cationic dyes, optical brighteners,humectants, emollients, and the like.

Tissue webs that may be treated with the temperature change compositionmay include a single homogenous layer of fibers or may include astratified or layered construction. For instance, the tissue web ply mayinclude two or three layers of fibers. Each layer may have a differentfiber composition.

Each of the fiber layers contains a dilute aqueous suspension ofpapermaking fibers. The particular fibers contained in each layergenerally depends upon the product being formed and the desired results.In one embodiment, for instance, a middle layer contains southernsoftwood kraft fibers either alone or in combination with other fibers,such as high yield fibers. The outer layers, on the other hand, cancontain softwood fibers, such as northern softwood kraft.

In an alternative embodiment, the middle layer may contain softwoodfibers for strength, while the outer layers may contain hardwood fibers,such as eucalyptus fibers, for a perceived softness.

The basis weight of tissue webs can vary depending upon the finalproduct. For example, the process may be used to produce facial tissues,bath tissues, paper towels, industrial wipers, and the like. In general,the basis weight of the tissue products may vary from about 10 gsm toabout 80 gsm, such as from about 20 gsm to about 60 gsm. For bath andfacial tissues, for instance, the basis weight may range from about 10gsm to about 60 gsm. For paper towels, on the other hand, the basisweight may range from about 25 gsm to about 80 gsm.

The tissue web bulk may also vary from about 2 cc/g to 20 cc/g, such asfrom about 5 cc/g to 15 cc/g. The sheet “bulk” is calculated as thequotient of the caliper of a dry tissue sheet, expressed in microns,divided by the dry basis weight, expressed in grams per square meter.The resulting sheet bulk is expressed in cubic centimeters per gram.More specifically, the caliper is measured as the total thickness of astack of ten representative sheets and dividing the total thickness ofthe stack by ten, where each sheet within the stack is placed with thesame side up. Caliper is measured in accordance with TAPPI test methodT411 om-89 “Thickness (caliper) of Paper, Paperboard, and CombinedBoard” with Note 3 for stacked sheets. The micrometer used for carryingout T411 om-89 is an Emveco 200-A Tissue Caliper Tester available fromEmveco, Inc. (Newberg, Oreg.). The micrometer has a load of 2.00kilo-Pascals (132 grams per square inch), a pressure foot area of 2500square millimeters, a pressure foot diameter of 56.42 millimeters, adwell time of 3 seconds and a lowering rate of 0.8 millimeters persecond.

In multiple ply products, the basis weight of each tissue web present inthe product can also vary. In general, the total basis weight of amultiple ply product will typically be the same as indicated above, suchas from about 20 gsm to about 80 gsm. Thus, the basis weight of each plycan be from about 5 gsm to about 60 gsm, such as from about 10 gsm toabout 40 gsm. In accordance with the present disclosure, the tissueproduct 10 contains a temperature change composition for imparting acooling sensation to the skin of a user.

The temperature change composition for imparting a cooling sensation tothe skin of a user is constructed of a structured emulsion containing aphase change material, a crystalline initiator, a carrier, and asurfactant. The temperature change composition undergoes a phase changeat a temperature between about 20° C. and 32° C. for cooling the skinduring use of the dry tissue or similar dry wiping product. Phase changematerials are known to cause irritation as it easily penetrates skin.Use of a structured emulsion helps to transfer the composition to theskin but limits or eliminates contacting of the phase change materialwith the skin of the user and/or transferring to the skin and/or wickingfrom the product. Thus, the structured emulsion can reduce irritationcaused by the phase change materials from the product prior to use.

The structured emulsion for use with the temperature change compositionmay be selected from various types of structured emulsion including, butnot limited to, an alpha-phase emulsion, a discontinuous cubic (micellarcubic) emulsion, a hexagonal phase emulsion, a lamellar emulsion, abicontinuous cubic emulsion, a reverse hexagonal emulsion, an inversecubic emulsion, and a d-phase emulsion.

To achieve delivery of the cooling sensation, a temperature changecomposition is desirably in the form of an oil phase dispersed in asingle phase cubic liquid crystal or “d-phase” concentrated emulsion.Preferably, the oil phase is present in the composition in an amountfrom 50-100%, more preferably from 60-90% and most preferably from65-85%. The amount of oil added is at a desirable level when theemulsion micelles shift from a spherical to a more polygonal shape. Thatis, the droplets increase in size by internally packing such that theypush up against one another and at the point of contact with adjacentmicelles the pressure exerted creates an equilibrium plateau instead ofthe normal curvature expected in a micellar sphere.

Structured emulsions such as d-phase emulsions are well known in theart. However, d-phase emulsions are thought to be efficient atdelivering actives and molecules into the skin. For example, interactionbetween liquid crystalline phase and the skin lipids is thought toenhance the transdermal delivery of a lipophilic entity, octadecenediocacid, within a crystalline emulsion. (Otto, A., Du Plessis, J. andWeichers, J. W. Formulation effects of topical emulsions on transdermaland dermal delivery. Intl. J. of Cosmetic Science. 31, 11-12 (2009).Therefore, it would be expected that including a hydrophobic phasechange material within a d-phase emulsion would provide better transferof the phase change material and cause greater irritation.

However, use of the temperature change composition comprising astructured emulsion, such as a d-phase emulsion, disclosed herein helpsto transfer the composition to the skin but unexpectedly limits oreliminates contacting of the phase change material with the skin of theuser and/or transferring to the skin and/or wicking from the product. Asevidenced by the Examples discussed herein, use of a crystallineinitiator within the d-phase emulsion provides a temperature changecomposition that is cooling, but is not irritating to the skin. Thus,the structured emulsion can reduce irritation and prevent removal of thephase change agents from the product prior to use. With priortemperature change compositions, disclosed in for example, PCT PatentApplication No. PCT/IB2009/051515 entitled “Tissue Products having aCooling Sensation When Contacted with Skin,” the phase change materialstransfer to the skin and cause irritation.

The temperature change composition can be incorporated into the tissueproduct 10 using any suitable method or technique. For example, thetemperature change composition can be sprayed onto the tissue product,extruded onto the tissue product, or printed onto the tissue productusing, for instance, flexographic printing, direct gravure printing, orindirect gravure printing. In still another embodiment, the temperaturechange composition can be applied to the tissue product using anysuitable coating equipment, such as a knife coater, UFD coater, or slotcoater. As the temperature change composition is solid at roomtemperature in one embodiment, it may be desirable to melt thecomposition prior to application to the tissue web. The application ofsuch molten materials to a finished tissue web is well known in the art.At times it may also be advantageous to cool the web directly afterapplication of the molten phase change material, especially when thetreated product is wound into a spirally wound roll either for afinished product or for further processing. The cooling of the web belowthe melting point of the phase change material reduces the potential ofthe spirally wound web from becoming “blocked”. “Blocked,” as usedherein, refers to the tendency of adjacent facing sheets in the spirallywound roll to adhere to each other and restrict the ability to unwindthe web from the spirally wound roll.

The temperature change composition includes at least one phase changematerial that undergoes a phase change when heated which, in turn,provides a cooling sensation to the skin. In general, a phase changematerial includes any substance that has the capability of absorbing orreleasing thermal energy to reduce or eliminate heat flow at or within atemperature stabilizing range. The temperature stabilizing range mayinclude a particular transition temperature or range of transitiontemperatures. A phase change material used preferably will be capable ofaltering a flow of thermal energy during a time when the phase changematerial is absorbing or releasing heat, typically as the phase changematerial undergoes a transition between two states (e.g., liquid andsolid states, liquid and gaseous states, solid and gaseous states, ortwo solid states). This action is typically transient, meaning it willoccur until a latent heat of the phase change material is absorbed orreleased during a heating or cooling process. Thermal energy may bestored or removed from the phase change material, and the phase changematerial typically can be effectively recharged by a source of heat orcold. The temperature change compositions exhibit a phase change attemperatures between about 23° C. and about 35° C. such as to beappropriate for use in cooling skin. In other embodiments materials maybe chosen with transition temperatures between about 23° C. and about32° C., between about 26° C. and about 32° C., or within any othersuitable range. The phase change temperature is selected such that thephase change occurs between the ambient temperature of the product andthe external temperature of the user's skin.

The temperature change composition may contain a mixture of phase changematerials that have a mixture of transition temperatures. When a mixtureof phase change materials is used, the components can be selected so asto have a collective melting point within the above mentioned limits. Insome cases the melting points of the individual phase change materialscomprising the temperature change composition may lie outside themelting point limits for the phase change temperature of the temperaturechange composition. However, the mixture of phase change materials willdisplay a phase change within the desired temperature limits. When thetemperature change composition is held against the skin either directlyor indirectly, the composition warms to the temperature of the skin fromroom temperature. The phase change material then melts at its specifiedphase change temperature. That melting requires heat, which is takenfrom the skin, imparting a feeling of cooling. Once the material ismelted, the cooling sensation dissipates. Having a range of phase changetemperatures (melting points in this case) of the phase change materialsmay extend the range of temperatures where cooling is felt. In oneexample, a combination of phase change materials having phase changetemperatures at 18° C., 26° C., and 35° C. are combined to create atemperature change composition having a melting point between 23° C. and32° C.

Suitable phase change materials include, by way of example and not bylimitation, encapsulated phase change powder, (e.g., LURAPRET, apurified, encapsulated paraffin available from BASF and MPCM 43-Davailable from Microtek Laboratories), hydrocarbons (e.g., straightchain alkanes or paraffinic hydrocarbons, branched-chain alkanes,unsaturated hydrocarbons, halogenated hydrocarbons, and alicyclichydrocarbons), waxes, natural butters, fatty acids, fatty acid esters,dibasic acids, dibasic esters, 1-halides, primary alcohols, aromaticcompounds, anhydrides (e.g., stearic anhydride), ethylene carbonate,polyhydric alcohols (e.g., 2,2-dimethyl-1,3-propanediol,2-hydroxymethyl-2-methyl-1,3-propanediol, pentaerythritol,dipentaerythritol, pentaglycerine, tetramethylol ethane, neopentylglycol, tetramethylol propane, monoaminopentaerythritol,diaminopentaerythritol, and tris(hydroxymethyl)acetic acid), polymers(e.g., polyethylene, polyethylene glycol, polypropylene, polypropyleneglycol, polytetramethylene glycol, and copolymers, such as polyacrylateor poly(meth)acrylate with alkyl hydrocarbon side chain or withpolyethylene glycol side chain and copolymers comprising polyethylene,polyethylene glycol, polypropylene, polypropylene glycol, orpolytetramethylene glycol), and mixtures thereof. Two well suited phasechange materials are stearyl heptanoate and n-octadecane. Otherdesirable phase change materials include tricaprin, parrafin,nonadecane, octadecane, stearyl heptanoate, lauryl lactate, laurylalcohol, capric acid, caprylic acid, cetyl babassuate, mangifera indica(mango) seed butter, theobroma cacao (cocoa) seed butter, butyrospermumparkii butter, Di-C₁₂₋₁₅ Alkyl Fumarate, stearyl caprylate, cetyllactate, cetyl acetate, C₂₄₋₂₈ alkyl methicone, glyceryl dilaurate,stearamidopropyl PG-dimonium chloride phosphate, jojoba esters, andcombinations thereof.

As described above, in one embodiment, the temperature changecomposition may contain a mixture of two or more phase change materials.In one particular embodiment, the temperature change compositioncontains a mixture of stearyl heptanoate and n-octadecane.

Phase change materials may include phase change materials in anon-encapsulated form and phase change materials in an encapsulatedform. A phase change material in a non-encapsulated form may be providedas a solid in a variety of forms (e.g., bulk form, powders, pellets,granules, flakes, paste, and so forth) or as a liquid in a variety offorms (e.g., molten form, dissolved in a solvent, and so forth).

Another aspect of the temperature change compositions is the heat offusion of the temperature change composition comprising the phase changematerials. The temperature change compositions can have heats of fusionof at least about 100 J/g, such as at least about 120 J/g, such as atleast about 145 J/g, such as at least about 165 J/g, such as at leastabout 190 J/g. For instance, in one embodiment, the temperature changecomposition contains a hydrocarbon as the phase change material, such asa straight chain hydrocarbon. The hydrocarbon, for instance, may containmore than about 12 carbon atoms in the chain, such as from about 18carbon atoms to about 19 carbon atoms in the chain. Particular examplesof phase change materials include, for instance, octadecane (heat offusion of about 213 J/g), nonadecane, stearyl heptanoate, and mixturesthereof.

The phase change materials can be contained in the temperature changecomposition in an amount from about 1% by weight of the temperaturechange composition to 99% by weight of the temperature changecomposition, such as from about 5% by weight of the temperature changecomposition to about 90% by weight of the temperature changecomposition. For example, in particular embodiments, the phase changematerials may be present in the temperature change composition in anamount from about 50% by weight of the temperature change composition toabout 80% by weight of the temperature change composition.

Desirably, the crystalline initiator is selected from fatty alcohols,fatty acids, esters, sugars, salts, crystalline and microcrystallinewaxes, microcrystalline triglycerides, and combinations thereof.

Typically, the crystalline initiator is present in an amount betweenabout 0.1% by weight of the temperature change composition and about 20%by weight of the temperature change composition more typically fromabout 1% by weight of the temperature change composition to about 15% byweight of the temperature change composition, and even more typicallyfrom about 2% by weight of the temperature change composition to about10% by weight of the temperature change composition.

As discussed above, the temperature change composition includes acarrier. Desirably, the carrier is selected from water, glycerin,diglycerin, glycerin derivatives, glycols, glycol derivatives, sugars,ethoxylated and/or propoxylated esters and ethers, urea, sodium PCA,alcohols, ethanol, isopropyl alcohol, or combinations thereof.

Typically, the temperature change compositions contain a carrier in anamount from about 1% by weight of the temperature change composition toabout 40% by weight of the temperature change composition, moretypically from about 2% by weight of the temperature change compositionto about 25% by weight of the temperature change composition.

The temperature change composition also contains a surfactant. Examplesof suitable surfactants to form a structured emulsion include sugaresters and their derivatives, sucrose esters, polyglyceryl esters,sorbitan esters, fatty acid esters, alkylpolyglucosides, andcombinations thereof. Desirable surfactants include sorbitan stearate,sorbityl laurate, sucrose palmitate, sucrose cocoate, cetearyl olivate,sorbitan olivate, cetearyl glucoside, coco glucoside, myristylglucoside, isostearyl glucoside, and combinations thereof. Thetemperature change composition may suitably include one or moresurfactants in an amount from about 0.5% by weight of the temperaturechange composition to about 15% by weight of the temperature changecomposition.

Typically, the temperature change composition is thermally reversible.Thus the temperature change composition is such that at below atransition temperature, the composition exists in a solid or hard gelstate. At a temperature of at least 50° C., the composition exists in aflowable gel state, but maintains a viscosity range of about 500 cps toabout 20,000 cps, more desirably a range of about 1000 cps to about10,000 cps, more desirably a range of about 2000 cps to about 6000 cps.

Having a thermally reversible temperature change composition is veryimportant. A temperature change composition which is thermallyreversible allows the product to be exposed to extreme temperaturesduring transportation of the product and still work effectively in thehome when used by a consumer. The thermally reversible temperaturechange composition disclosed herein will change from a solid state toliquid state and back to a solid as the temperatures change. Thus, thephase change materials to provide a cooling effect are still availableafter long periods of storage and transportation at varioustemperatures. Previous temperature change compositions, disclosed in forexample, PCT Patent Application No. PCT/IB2009/051515 entitled “TissueProducts having a Cooling Sensation When Contacted with Skin” are notthermally reversible and do not provide these benefits.

The temperature change composition uses a phase change material toprovide a measurable cooling benefit but also uses a delivery vehiclesuch that the phase change material is entrapped within an emulsion soit can cool and not irritate skin. It consists of two distinctlydifferent phases, a dispersed phase and a continuous phase, emulsifiedtogether to create an d-phase emulsion.

To prepare the temperature change composition disclosed herein, acontinuous phase is prepared by mixing together a surfactant andcarrier. A phase change material is mixed together with a crystallineinitiator to prepare a second phase. The second phase is added to thecontinuous phase and the second phase is dispersed within the continuousphase.

Because the oil is the internal phase of the d-phase emulsion, thetemperature change composition has increased absorbency when applied tothe substrate. The temperature change composition can incorporate waterfrom secretions into the polar phase of the emulsion. Therefore,absorption of water and similar aqueous secretions is nearlyinstantaneous. Typically, the dry tissue products using the temperaturechange compositions can absorb a single drop of water placed on thetreated side of tissue within 90 seconds, within 60 seconds, within 45seconds, more typically absorbing a single drop of water within 30seconds, and even more typically absorbing a single drop of water within20 seconds.

Additionally, in production, cleaning up the machinery and workspaceused to produce traditional lotion tissue can be lengthy as theformulations form a waxy solid at temperatures below their melting point(typically <50-60° C.) which needs to be scraped or melted off ofsurfaces or otherwise removed. The temperature change compositioncontains a hydrophilic phase in addition to the hydrophobic phase. Thus,the temperature change composition can easily be cleaned up with waterand minimal labor.

Another important factor is the heat absorption factor of the products.The heat absorption factor, expressed in J/m², is the product of theheat of fusion of the temperature change composition expressed in J/gramand the application rate of the temperature change composition appliedto the tissue product expressed in gram per meter squared (gsm). Theheat absorption factor of the products can be at least about 500 J/m²,such as at least about 1000 J/m² such as from about 1000 J/m² to about4000 J/m² or greater. For many applications, the temperature changecomposition can be applied to a tissue web such that the phase changematerials are present on the web in an amount from about 4 gsm to about40 gsm.

The temperature change composition may take a variety of formsincluding, without limitation, aqueous solutions, gels, balms, lotions,suspensions, creams, milks, salves, ointments, sprays, foams, solidsticks, and the like.

Also, as typical lotion tissues consist primarily of oils and waxes, itis difficult, if not impossible, to incorporate skin health ingredientsof a hydrophilic nature into the formulation at adequate amounts to seethe associated benefit of the ingredients. The temperature changecomposition can include either hydrophilic or hydrophobic skin healthingredients as it contains both a hydrophilic continuous phase and ahydrophobic dispersed phase within the emulsion.

Examples of other skin health ingredients that may be included withinthe temperature change composition are emollients, sterols or sterolderivatives, natural and synthetic fats or oils, viscosity enhancers,rheology modifiers, polyols, surfactants, alcohols, esters, silicones,clays, starch, cellulose, particulates, moisturizers, film formers, slipmodifiers, surface modifiers, skin protectants, humectants, sunscreens,anti-wrinkle actives, soothing agents, antioxidants, and the like.

Thus, the temperature change compositions may further optionally includeone or more emollients, which typically act to soften, soothe, andotherwise lubricate and/or moisturize the skin. Suitable emollients thatcan be incorporated into the compositions include oils such as naturaloils such as jojoba, sunflower, safflower, and the like, synthetic basedoils such as petrolatum, mineral oils, alkyl dimethicones, alkylmethicones, alkyldimethicone copolyols, phenyl silicones, alkyltrimethylsilanes, dimethicone, dimethicone crosspolymers,cyclomethicone, lanolin and its derivatives, glycerol esters andderivatives, propylene glycol esters and derivatives, fatty acid estersand derivatives, alkoxylated carboxylic acids, alkoxylated alcohols, andcombinations thereof.

Ethers such as eucalyptol, cetearyl glucoside, dimethyl isosorbicpolyglyceryl-3 cetyl ether, polyglyceryl-3 decyltetradecanol, propyleneglycol myristyl ether, and combinations thereof, can also suitably beused as emollients.

The temperature change composition may include one or more emollients inan amount from about 0.01% by weight of the temperature changecomposition to about 70% by weight of the temperature changecomposition, more desirably from about 0.05% by weight of thetemperature change composition to about 50% by weight of the temperaturechange composition, and even more desirably from about 0.1% by weight ofthe temperature change composition to about 40% by weight of thetemperature change composition.

Optionally, one or more viscosity enhancers may be added to thetemperature care composition to increase the viscosity, to helpstabilize the composition, such as when the composition is incorporatedinto a personal care product, thereby reducing migration of thecomposition and improve transfer to the skin. Suitable viscosityenhancers include polyolefin resins, lipophilic/oil thickeners,polyethylene, silica, silica silylate, silica methyl silylate, colloidalsilicone dioxide, cetyl hydroxy ethyl cellulose, other organicallymodified celluloses, PVP/decane copolymer, PVM/MA decadienecrosspolymer, PVP/eicosene copolymer, PVP/hexadecane copolymer, clays,carbomers, acrylate based thickeners, surfactant thickeners, andcombinations thereof.

The temperature change composition may include one or more viscosityenhancers in an amount from about 0.01% by weight of the temperaturechange composition to about 25% by weight of the temperature changecomposition, more desirably from about 0.05% by weight of thetemperature change composition to about 10% by weight of the temperaturechange composition, and even more desirably from about 0.1% by weight ofthe temperature change composition to about 10% by weight of thetemperature change composition.

The temperature change composition may optionally further containrheology modifiers. Rheology modifiers may help increase the melt pointviscosity of the composition so that the composition readily remains onthe surface of a personal care product.

Suitable rheology modifiers include combinations of alpha-olefins andstyrene alone or in combination with mineral oil or petrolatum,combinations of di-functional alpha-olefins and styrene alone or incombination with mineral oil or petrolatum, combinations ofalpha-olefins and isobutene alone or in combination with mineral oil orpetrolatum, ethylene/propylene/styrene copolymers alone or incombination with mineral oil or petrolatum, humectant/ethylene/styrenecopolymers alone or in combination with mineral oil or petrolatum,ethylene/vinyl acetate copolymers, polyethylene polyisobutylenes,polyisobutenes, polyisobutylene, dextrin palmitate, dextrin palmitateethylhexanoate, stearoyl inulin, stearalkonium bentonite,distearadimonium hectorite, and stearalkonium hectorite,styrene/butadiene/styrene copolymers, styrene/isoprene/styrenecopolymers, styrene-ethylene/humectant-styrene copolymers,styrene-ethylene/propylene-styrene copolymers, (styrene-butadiene)n-polymers, (styrene-isoprene) n-polymers, styrene-butadiene copolymers,and styrene-ethylene/propylene copolymers, and combinations thereof.Specifically, rheology enhancers such as mineral oil andethylene/propylene/styrene copolymers, and mineral oil andhumectant/ethylene/styrene copolymers are particularly desirable.

The temperature change composition can suitably include one or morerheology modifiers in an amount from about 0.1% by weight of thetemperature change composition to about 10% by weight of the temperaturechange composition.

The temperature change composition may optionally further containhumectants. Examples of suitable humectants include glycerin, glycerinderivatives, 1,3-propanediol, sodium hyaluronate, betaine, amino acids,glycosaminoglycans, honey, sugar alcohols, sorbitol, glycols, polyols,sugars, hydrogenated starch hydrolysates, salts of PCA, lactic acid,lactates, and urea. A particularly preferred humectant is glycerin. Thetemperature change composition may suitably include one or morehumectants in an amount from about 0.05% by weight of the temperaturechange composition to about 50% by weight of the temperature changecomposition.

The temperature change composition may optionally further contain filmformers. Examples of suitable film formers include lanolin derivatives(e.g., acetylated lanolins), superfatted oils, cyclomethicone,cyclopentasiloxane, dimethicone, synthetic and biological polymers,proteins, quaternary ammonium materials, starches, gums, cellulosics,polysaccharides, albumen, acrylates derivatives, IPDI derivatives, andthe like. The composition may suitably include one or more film formersin an amount from about 0.01% by weight of the temperature changecomposition to about 20% by weight of the temperature changecomposition.

The temperature change composition may optionally further contain slipmodifiers. Examples of suitable slip modifiers include bismuthoxychloride, iron oxide, mica, surface treated mica, ZnO, ZrO₂, silica,silica silyate, colloidal silica, attapulgite, sepiolite, starches (i.e.corn, tapioca, rice), cellulosics, nylon-12, nylon-6, polyethylene,talc, styrene, polystyrene, polypropylene, ethylene/acrylic acidcopolymer, acrylates, acrylate copolymers (methylmethacrylatecrosspolymer), sericite, titanium dioxide, aluminum oxide, siliconeresin, barium sulfate, calcium carbonate, cellulose acetate, polymethylmethacrylate, polymethylsilsequioxane, talc, tetrafluoroethylene, silkpowder, boron nitride, lauroyl lysine, synthetic oils, natural oils,esters, silicones, glycols, and the like. The composition of the presentdisclosure may suitably include one or more slip modifiers in an amountfrom about 0.01% by weight of the temperature change composition toabout 20% by weight of the temperature change composition.

The temperature change composition may also optionally contain surfacemodifiers. Examples of suitable surface modifiers include silicones,quaternium materials, powders, salts, peptides, polymers, clays, andglyceryl esters. The composition of the present disclosure may suitablyinclude one or more surface modifiers in an amount from about 0.01% byweight of the temperature change composition to about 20% by weight ofthe temperature change composition.

The temperature change composition may also optionally contain skinprotectants. Examples of suitable skin protectants include ingredientsreferenced in SP Monograph (21 CFR part 347). Suitable skin protectantsand amounts include those set forth in SP Monograph, Subpart B—ActiveIngredients Sec 347.10: (a) Allantoin, 0.5 to 2%, (b) Aluminum hydroxidegel, 0.15 to 5%, (c) Calamine, 1 to 25%, (d) Cocoa butter, 50 to 100%,(e) Cod liver oil, 5 to 13.56%, in accordance with 347.20(a)(1) or(a)(2), provided the product is labeled so that the quantity used in a24-hour period does not exceed 10,000 U.S.P. Units vitamin A and 400U.S.P. Units cholecalciferol, (f) Colloidal oatmeal, 0.007% minimum;0.003% minimum in combination with mineral oil in accordance with§347.20(a)(4), (g) Dimethicone, 1 to 30%, (h) Glycerin, 20 to 45%, (i)Hard fat, 50 to 100%, (j) Kaolin, 4 to 20%, (k) Lanolin, 12.5 to 50%,(l) Mineral oil, 50 to 100%; 30 to 35% in combination with colloidaloatmeal in accordance with §347.20(a)(4), (m) Petrolatum, 30 to 100%,(n) Sodium bicarbonate, (o) Topical starch, 10 to 98%, (p) Whitepetrolatum, 30 to 100%, (q) Zinc acetate, 0.1 to 2%, (r) Zinc carbonate,0.2 to 2%, (s) Zinc oxide, 1 to 25%.

The temperature change composition may also optionally containquaternary ammonium materials. Examples of suitable quaternary ammoniummaterials include polyquaternium-7, polyquaternium-10, benzalkoniumchloride, behentrimonium methosulfate, cetrimonium chloride,cocamidopropyl pg-dimonium chloride, guar hydroxypropyltrimoniumchloride, isostearamidopropyl morpholine lactate, polyquaternium-33,polyquaternium-60, polyquaternium-79, quaternium-18 hectorite,quaternium-79 hydrolyzed silk, quaternium-79 hydrolyzed soy protein,rapeseed amidopropyl ethyldimonium ethosulfate, silicone quaternium-7,stearalkonium chloride, palmitamidopropyltrimonium chloride,butylglucosides, hydroxypropyltrimonium chloride,laurdimoniumhydroxypropyl decylglucosides chloride, and the like. Thecomposition of the present disclosure may suitably include one or morequaternary materials in an amount from about 0.01% by weight of thetemperature change composition to about 20% by weight of the temperaturechange composition.

The temperature change composition may also optionally containadditional emulsifiers. As mentioned above, the natural fatty acids,esters and alcohols and their derivatives, and combinations thereof, mayact as emulsifiers in the composition. Optionally, the composition maycontain an additional emulsifier other than the natural fatty acids,esters and alcohols and their derivatives, and combinations thereof.Examples of suitable emulsifiers include nonionics such as polysorbate20, polysorbate 80, anionics such as DEA phosphate, cationics such asbehentrimonium methosulfate, and the like. The composition of thepresent disclosure may suitably include one or more additionalemulsifiers in an amount from about 0.01% by weight of the temperaturechange composition to about 20% by weight of the temperature changecomposition.

The temperature change composition may additionally include adjunctcomponents conventionally found in pharmaceutical compositions in theirart-established fashion and at their art-established levels. Forexample, the compositions may contain additional compatiblepharmaceutically active materials for combination therapy, such asantimicrobials, antioxidants, anti-parasitic agents, antipruritics,antifungals, antiseptic actives, biological actives, astringents,keratolytic actives, local anesthetics, anti-stinging agents,anti-reddening agents, skin soothing agents, and combinations thereof.Other suitable additives that may be included in the compositions of thepresent disclosure include colorants, deodorants, fragrances, perfumes,emulsifiers, anti-foaming agents, lubricants, natural moisturizingagents, skin conditioning agents, skin protectants and other skinbenefit agents (e.g., extracts such as aloe vera and anti-aging agentssuch as peptides), solvents, solubilizing agents, suspending agents,wetting agents, humectants, preservatives, pH adjusters, bufferingagents, dyes and/or pigments, and combinations thereof.

Although the temperature change composition can be present on anexterior surface of the tissue product 10 as shown on FIG. 1, in oneembodiment, the temperature change composition can be incorporated intothe tissue product in a manner so that substantially none of thetemperature change composition is present on the exterior surfaces. Forinstance, referring to FIG. 2, a tissue product 20 is shown that iscomprised of a first tissue web 22 laminated to a second tissue web 24.As shown, positioned in between the first tissue web 22 and the secondtissue web 24 is a temperature change composition 26 as describedherein. By locating the temperature change composition 26 in between thetissue webs, the temperature change composition is substantiallyprevented from being transferred to a user's skin. When the tissueproduct 20, however, is held against the skin, body heat will beabsorbed by the temperature change composition 26 through the tissuewebs thus elevating in temperature. The increase in temperature willcause a phase change to occur in the phase change material providing acooling sensation to the skin of the user.

In one specific embodiment the cooling tissue product is a facial tissuecomprising three or more plies, two outer plies and one or more interiorplies. The temperature change composition is applied to at least one ofthe one or more interior plies. In another embodiment, the coolingtissue product is a facial tissue comprising two plies, comprising twoouter facing surfaces and two oppositely facing inner surfaces. Thephase change composition is applied to one or both of the oppositelyfacing inner surfaces. In another embodiment, the product is a multi-plytissue product where the phase change composition is applied selectivelyto the inner portion of the multi-ply product so as to minimizeblocking.

In this manner, other beneficial compositions may be applied to theexterior surface of the tissue product and used in conjunction with thetemperature change composition 26. For example, in one embodiment, alotion that is intended to moisturize the skin can be present on atleast one exterior surface of the tissue product and may work inconjunction with the temperature change composition. In this manner, thetissue product 20 can not only provide a cooling sensation to the user,but can also transfer a moisturizer to the skin.

In addition to lotions, any other suitable composition may also beapplied to the exterior surface. For instance, in one embodiment,various softening agents may be present on the exterior surfaces of thetissue product. One example of a softening agent may contain apolysiloxane.

In addition to a 2-ply product as shown in FIG. 2, other tissue productsthat may included the temperature change compostion can include morethan two plies. For example, a 3-ply tissue product 30 is illustrated inFIG. 3. As shown, the tissue product 30 includes a middle tissue web 34laminated to outer tissue webs 32 and 36. In accordance with the presentdisclosure, a temperature change composition is located in between thefirst tissue web 32 and the middle tissue web 34. A temperature changecomposition 40 is also positioned in between the middle tissue web 34and the second outer tissue web 36.

In an alternative embodiment, the temperature change composition canalso be present on one or more exterior surfaces of a tissue product.For instance, referring to FIG. 4, in one embodiment, the temperaturechange composition can be applied to an exterior surface of a bathtissue product 50. As shown, the bath tissue product 50 contains aspirally wound product containing individual tissue sheets 52 separatedby perforation lines 54. The tissue sheets can include a first exteriorsurface 56 and a second exterior surface 58. Each tissue sheet maycontain a single ply product or a multi-ply product. The temperaturechange composition may be present on the first exterior surface 56, onthe second exterior surface 58, or on both exterior surfaces.

Applying the temperature change composition to a bath tissue product asshown in FIG. 4 may provide various unexpected benefits and advantages.For example, the temperature change composition may provide a coolingsensation that actually makes the bath tissue sheet evoke a sensation ofwetness to the user. The sense of wetness can lead to a perception ofimproved cleaning.

When applied to a bath tissue as shown in FIG. 4, the temperature changecomposition may contain a moisturizer as described above so as toprovide further benefits to the user.

EXAMPLES

The present disclosure may be better understood with reference to thefollowing examples.

Example 1

Example 1, illustrated in Table 1, demonstrates a composition using aphase change material, a crystalline initiator, a surfactant, and acarrier.

TABLE 1 Example 1 Ingredient Wt. % Phase A Sucrose Laurate 3 Glycerin 19Water 5 Phase B Stearyl Heptanoate 63 Stearyl Alcohol 10

First, Phase A was created by mixing the three components at 70° C.until uniform. Simultaneously, Phase B was created by mixing the twocomponents at 70° C. until uniform. Phase B was then added to phase Awith high shear mixing (5000 rpm). Once Phase B is added to Phase A, themixture was mixed at 10,000 rpm for 5 minutes.

Example 1 produced a solid white gel that is in solid state aftercooling to room temperature. A portion of the sample was rubbed on theskin of two human subjects and a considerable cooling effect was felt.This illustrates that the phase change material in combination with acrystalline initiator sets up a d-phase emulsion ideal for cooling.

Comparative Example 1

Comparative Example 1, illustrated in Table 2, demonstrates acomposition created using a phase change material, a surfactant, and acarrier. No crystalline initiator was used within the comparativeexample.

TABLE 2 Comparative Example 1 Ingredient Wt. % Phase A Sucrose Laurate 6Glycerin 19 Water 5 Phase B Stearyl Heptanoate 70

First, Phase A was created by mixing the three components at 70° C.until uniform. Phase B was then added to phase A with high shear mixing(5000 rpm). Once Phase B was added to Phase A, the mixture was mixed at10,000 rpm for 5 minutes.

Comparative Example 1 did not produce a solid white gel. Instead, itproduced a transparent gel that remained a transparent gel after coolingto room temperature. Upon application to the skin, the transparent geldid not phase change on the skin and therefore no cooling was felt. Thesample was placed into a refrigerator to try to induce crystallizationof the phase change material. After 2 hours, the sample was taken out ofthe refrigerator and allowed to acclimate to room temperature. Theresultant gel was no longer transparent, but had turned into a whitegel. A portion of the sample was rubbed on the skin of 2 human subjectsbut no cooling was felt. This illustrates that the phase change materialdid not set up a d-phase emulsion adequate for cooling in this deliveryvehicle without a crystalline initiator.

Comparative Example 2

Comparative Example 2, illustrated in Table 3, is a composition thatdoes not contain a phase change material, but includes a crystallineinitiator. The ingredients were combined and heated to 60° C. untilhomogenous. The composition was cooled and produced a solid white pasteat room temperature. The paste was rubbed on the skin of 2 humansubjects but no cooling was felt. This illustrates that the crystallineinitiator by itself does not set up a crystalline network sufficient forcooling the skin.

TABLE 3 Comparative Example 2 Ingredient Wt. % Petrolatum 60 StearylAlcohol 6

These and other modifications and variations to the appended claims maybe practiced by those of ordinary skill in the art, without departingfrom the spirit and scope of the appended claims. In addition, it shouldbe understood that aspects of the various embodiments may beinterchanged both in whole and in part. Furthermore, those of ordinaryskill in the art will appreciate that the foregoing description is byway of example only, and is not intended to limit the appended claims.

What is claimed:
 1. A dry tissue product comprising: a first tissue webcomprising fibers, the tissue web including a first side and a secondside; and a temperature change composition present on at least the firstside of the tissue web, the temperature change composition beingdispersed in a single phase cubic liquid crystal, the temperature changecomposition comprising a structured emulsion containing: a phase changematerial present in an amount between about 20% by weight of thetemperature change composition and about 90% by weight of thetemperature change composition; a crystalline initiator; a carrier; anda surfactant.
 2. The dry tissue product of claim 1 wherein thecrystalline initiator is selected from fatty alcohols, fatty acids,esters, sugars, salts, crystalline and microcrystalline waxes,microcrystalline triglycerides, and combinations thereof.
 3. The drytissue product of claim 1 wherein the crystalline initiator is presentin an amount between about 0.1% by weight of the temperature changecomposition and about 30% by weight of the temperature changecomposition.
 4. The dry tissue product of claim 1 wherein the carrier isselected from water, glycerin, diglycerin, glycerin derivatives,glycols, glycol derivatives, sugars, ethoxylated and/or propoxylatedesters and ethers, urea, sodium PCA, alcohols, ethanol, isopropylalcohol, and combinations thereof.
 5. The dry tissue product of claim 1wherein the carrier is present in an amount between about 1% by weightof the temperature change composition and about 40% by weight of thetemperature change composition.
 6. The dry tissue product of claim 1wherein the surfactant is selected from sugar esters and theirderivatives, sucrose esters, polyglyceryl esters, sorbitan esters, fattyacid esters, alkylpolyglucosides, and combinations thereof.
 7. The drytissue product of claim 1 wherein the surfactant is present in an amountbetween about 0.5% by weight of the temperature change composition andabout 15% by weight of the temperature change composition.
 8. The drytissue product of claim 1 wherein the phase change material is selectedfrom a hydrocarbon, a wax, an oil, a natural butter, a fatty acid, afatty acid ester, a dibasic acid, a dibasic ester, a 1-halide, a primaryalcohol, an aromatic compound, an anhydride, an ethylene carbonate, apolyhydric alcohol, and combinations thereof.
 9. The dry tissue productof claim 1 wherein the phase change material is selected from tricaprin,parrafin, nonadecane, octadecane, stearyl heptanoate, lauryl lactate,lauryl alcohol, capric acid, caprylic acid, cetyl babassuate, mangiferaindica (mango) seed butter, theobroma cacao (cocoa) seed butter,butyrospermum parkii butter, Di-C₁₂₋₁₅Alkyl Fumarate, stearyl caprylate,cetyl lactate, cetyl acetate, C₂₄₋₂₈ alkyl methicone, glyceryldilaurate, stearamidopropyl PG-dimonium chloride phosphate, jojobaesters, and combinations thereof.
 10. The dry tissue product of claim 1wherein the phase change material is present in an amount between about50% by weight of the temperature change composition and about 80% byweight of the temperature change composition.
 11. The dry tissue productof claim 1 wherein the temperature change composition has a heat offusion of at least about 100 J/g.
 12. The dry tissue product of claim 1wherein the temperature change composition is thermally reversible. 13.The dry tissue product of claim 12 wherein the temperature changecomposition is solid at room temperature and has a phase change at atemperature of greater than about 26° C.
 14. The dry tissue product ofclaim 1 wherein the phase change material is oil soluble andhydrophobic.
 15. The dry tissue product of claim 1 wherein thetemperature change composition is present on the tissue web in an amountfrom about 4 gsm to about 40 gsm.